BrainWallet private keys. A brain wallet is a standard wallet that generates its address by hashing a passphrase to create a private key and therefore a public key and resultant address. Seeing as a Bitcoin address is usually a 256 bit string. Site collected about 19.000+ BrainWallet leaked private keys with transactions in the past. Instead of viewing the random private keys page and checking balances manually, you can use this tool to generate random private keys and check their balance automatically at high speed. Which blockchains are supported? Bitcoin Key Scanner supports Bitcoin, Bitcoin Cash, Bitcoin SV, Litecoin, Dogecoin, Dash, Zcash, Ethereum blockchains..